Heat

The heat in 2006 Impala will blow cold intermittent then go back to hot what is wrong? I can tell at stops is when it starts blowing cold but when accelerating it gets hotter.

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Saturday, November 27th, 2010 AT 3:57 PM

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GMTECH

EXPERT

It sounds like your heater core is plugged up. Upon acceleration more pressure is going through the cooling system to make it hot. Have the system flushed and the heater core back flushed.

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Saturday, November 27th, 2010 AT 4:10 PM

GMTECH

EXPERT

Lets clear the air about Jimmy's response. Jimmy apparently is not a mechanic otherwise he would know that you don't get air in the cooling system unless there is a leak. Posssibly a leaky intake or head gasket which is why pressure testing will not show anything. How often do you pressure test hot? Cold perhaps the gasket will not leak but hot it will. It is a sealed system. And also a 2006 impala will not have a 3.6L engine or a 3.9L. Those engines came out in the impala when the body style changed to the current style in 2007. It is normal for a heater core to be plugged after 4 or 5 years when the coolant is older. It is typical for a plugged core to give off more heat under acceleration as the pressure increases and decreases with lower rpm.
Jimmy, make sure you know what you are talking about before you tell someone that they shouldn't have their vehicle checked out by a professional. We can't see the vehicle in person so the best thing to do is guide not feed them BS.